An amphoteric oxide among the following is-

1. CaO                                                     

2. SrO

3. BeO                                                     

4. MgO

A colourless salt among the following that gives violet colour to Bunsen flame is -

1. Na₂CO₃

2. K₂CO₃

3. Cu(OH)₂

4. MgCO₃

The polarising power of Mg is close to that of –

1. Na                                       

2. Cs

3. Li                                         

4. K

The incorrect statement among the following regarding Lithium is that-

1. The hydroxide, carbonate and nitrate decompose to give the oxide on heating.

2. It is the most electronegative element of group IA.

3. The hydrogen carbonate cannot be isolated as a stable solid.

4. It forms superoxide.

The strongest factor responsible for reducing action of Li metal in an aqueous solution is :

1. Sublimation enthalpy .         

2. Ionisation enthalpy.

3. Hydration enthalpy .             

4. Electron-gain enthalpy.

The incorrect statement among the following is-

1. Lithium is the strongest reducing agent.

2. Density of potassium is more than sodium.

3. Cs are used in devising photoelectric cells.

4. All alkali metals give a blue solution in liquid ammonia.

The correct relation about the density of Na and K is 

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Property of the alkaline earth metals that increases with their atomic number is -

1. Solubility of their hydroxides in water.

2. Solubility of their sulphates in water.

3. Ionisation energy.

4. Electronegativity.

The incorrect statement among the following is-

 Alkali metal with the lowest melting point is -

1. Na

2. K

3. Rb

4. Cs